60 ROSACEAE 



7. Leaves very tomentose beneath. 8. 



Leaves more sparsely hairy. C. hupehensis. 



8. Leaves rather blunt at both ends. C. Zabelii. 

 Leaves rather acute at both ends. C. Dielsiana. 



9. Fruit red. 10. 

 Fruit black. 11. 



10. Leaf tomentum rather dense. C. tomentosa. 

 Leaf tomentum rather sparse. C. integerrima. 



11. Fruit not glaucous. C. acutifolia. 

 Fruit very glaucous. C. melanocarpa. 



AMELANCHIER. Shadbush. 



Shrubs or trees, usually rather small, with smooth bark; 

 reddish brown hard wood with minute ducts, more crowded in 

 spring, and fine medullary rays; slender nearly terete twigs; 

 somewhat 5-sided pale continuous pith; alternate sometimes 2- 

 ranked low crescent-shaped leaf -scars with 3 bundle-traces; 

 no stipule-scars; appressed elongated acute buds with about 5 

 exposed scales; moderate serrate petioled leaves; moderate 

 perfect polypetalous epigynous white flowers; and small berry- 

 like purple pomes. 



1. Leaves always glabrous, closely serrate. A. laevis. 

 Leaves for a time woolly beneath. 2. 



2. Leaves closely serrate (teeth 10 to 1 cm.). A. canadensis. 

 Leaves more distantly toothed (teeth 5 to 1 cm.). 3. 



3. Leaves rather acute, persistently tomentose, A. sanguinea. 

 Leaves very obtuse, quickly glabrous. A. alnifolia. 



CRATAEGUS. Haw. Red Haw. 



Deciduous shrubs or small trees usually with axillary 

 spines; hard usually brownish wood with very minute diffused 

 ducts and fine medullary rays; rounded twigs; somewhat an- 

 gular homogeneous pale pith; alternate not raised crescent- 

 shaped small leaf-scars with 3 bundle-traces; round-ovoid 

 solitary sessile buds with several fleshy often red scales; sim- 

 ple usually toothed or lobed stalked leaves frequently clustered 

 on spurs; moderate perfect epigynous white or rosy flowers 



